volume bola yang berdiameter 21 cm adalah ........... cm3 pake cara ya jelas !!

v = [tex] \frac{4}{3} \pi r^{3} [/tex]
= [tex] \frac{4}{3} X \frac{22}{7} X 10,5^{3} [/tex]
= [tex] \frac{4}{3} X \frac{22}{7} X 1157,625[/tex]
= [tex] \frac{4}{3} X 22 X 165,375[/tex]
= 4 X 55,125
= 220,500 / 200,5 [tex] cm^{3} [/tex]

r = 21/2 = 10.5cm
v bola = 4  x phi x r  x r x r
             3
v bola = 4/3 x 22/7 x 10,5 x 10,5 x 10.5
v bola =  4851 cm3